Police are looking to speak with anyone with information on a physical altercation involving Ramsay in the Ōakura township about 5pm on July 29, Matuku said.
"We also want to talk to anyone who saw a silver-coloured 2005 Peugeot station wagon in Ōakura at about that time, or may have noticed it travelling in the coastal area on that Friday evening."
Information can be given by contacting police on 105, quoting the file number 220731/0100.
Information can also be provided anonymously via Crime Stoppers on 0800 555 111 or online via www.crimestoppers-nz.org.
Meanwhile, a Givealittle page, named Justice for Jacob, has been set up to help assist the family, the spokesperson said.